Let's get this math done. We have 326 and we're going to multiply it by 90. This is the same as taking 326 and adding it to itself 90 times.
Step 1: 0 + 326 = 326
Step 2: 326 + 326 = 652
Step 3: 652 + 326 = 978
Step 4: 978 + 326 = 1304
Step 5: 1304 + 326 = 1630
Step 6: 1630 + 326 = 1956
Step 7: 1956 + 326 = 2282
Step 8: 2282 + 326 = 2608
Step 9: 2608 + 326 = 2934
Step 10: 2934 + 326 = 3260
Step 11: 3260 + 326 = 3586
Step 12: 3586 + 326 = 3912
Step 13: 3912 + 326 = 4238
Step 14: 4238 + 326 = 4564
Step 15: 4564 + 326 = 4890
Step 16: 4890 + 326 = 5216
Step 17: 5216 + 326 = 5542
Step 18: 5542 + 326 = 5868
Step 19: 5868 + 326 = 6194
Step 20: 6194 + 326 = 6520
Step 21: 6520 + 326 = 6846
Step 22: 6846 + 326 = 7172
Step 23: 7172 + 326 = 7498
Step 24: 7498 + 326 = 7824
Step 25: 7824 + 326 = 8150
Step 26: 8150 + 326 = 8476
Step 27: 8476 + 326 = 8802
Step 28: 8802 + 326 = 9128
Step 29: 9128 + 326 = 9454
Step 30: 9454 + 326 = 9780
Step 31: 9780 + 326 = 10106
Step 32: 10106 + 326 = 10432
Step 33: 10432 + 326 = 10758
Step 34: 10758 + 326 = 11084
Step 35: 11084 + 326 = 11410
Step 36: 11410 + 326 = 11736
Step 37: 11736 + 326 = 12062
Step 38: 12062 + 326 = 12388
Step 39: 12388 + 326 = 12714
Step 40: 12714 + 326 = 13040
Step 41: 13040 + 326 = 13366
Step 42: 13366 + 326 = 13692
Step 43: 13692 + 326 = 14018
Step 44: 14018 + 326 = 14344
Step 45: 14344 + 326 = 14670
Step 46: 14670 + 326 = 14996
Step 47: 14996 + 326 = 15322
Step 48: 15322 + 326 = 15648
Step 49: 15648 + 326 = 15974
Step 50: 15974 + 326 = 16300
Step 51: 16300 + 326 = 16626
Step 52: 16626 + 326 = 16952
Step 53: 16952 + 326 = 17278
Step 54: 17278 + 326 = 17604
Step 55: 17604 + 326 = 17930
Step 56: 17930 + 326 = 18256
Step 57: 18256 + 326 = 18582
Step 58: 18582 + 326 = 18908
Step 59: 18908 + 326 = 19234
Step 60: 19234 + 326 = 19560
Step 61: 19560 + 326 = 19886
Step 62: 19886 + 326 = 20212
Step 63: 20212 + 326 = 20538
Step 64: 20538 + 326 = 20864
Step 65: 20864 + 326 = 21190
Step 66: 21190 + 326 = 21516
Step 67: 21516 + 326 = 21842
Step 68: 21842 + 326 = 22168
Step 69: 22168 + 326 = 22494
Step 70: 22494 + 326 = 22820
Step 71: 22820 + 326 = 23146
Step 72: 23146 + 326 = 23472
Step 73: 23472 + 326 = 23798
Step 74: 23798 + 326 = 24124
Step 75: 24124 + 326 = 24450
Step 76: 24450 + 326 = 24776
Step 77: 24776 + 326 = 25102
Step 78: 25102 + 326 = 25428
Step 79: 25428 + 326 = 25754
Step 80: 25754 + 326 = 26080
Step 81: 26080 + 326 = 26406
Step 82: 26406 + 326 = 26732
Step 83: 26732 + 326 = 27058
Step 84: 27058 + 326 = 27384
Step 85: 27384 + 326 = 27710
Step 86: 27710 + 326 = 28036
Step 87: 28036 + 326 = 28362
Step 88: 28362 + 326 = 28688
Step 89: 28688 + 326 = 29014
Step 90: 29014 + 326 = 29340

So, 326*90 = 29340